10. Fuel filter

This is an item that’s probably as important as it is overlooked. Assuming yours is a fuel-injected car, the fuel filter is more or less on continuous duty whenever your ignition is on and the fuel pump is active, preventing impurities from clogging injectors. So, over time, replacement will be necessary. Locations vary from beneath the hood or undercarriage to inside the fuel tank itself. Since systems are often pressurized and fuel lines need to be safely crimped, you might prefer to let a technician handle it.